User Agent and Assistive Technology Support Notes

Description

The blink element, while not part of the official HTML or XHTML
specification, is supported by many user agents. It causes any text inside
the element to blink at a predetermined rate. This cannot be interrupted by
the user, nor can it be disabled as a preference. The blinking continues as
long as the page is displayed. Therefore, content that uses
blink fails the Success Criterion because blinking can continue
for more than three seconds.

Examples

Failure Example 1

A product list page uses the blink element to draw
attention to sale prices. This fails the Success Criterion because
users cannot control the blink.